13 61 501 Replacing control unit (DDE) (N47 D20 O 1 with SCR)

Necessary preliminary tasks: 

• Read out the fault memory of the DDE control unit.
• Switch off ignition.
• FOLLOW INSTRUCTIONS FOR REMOVING AND INSTALLING CONTROL UNITS .

Replacement: 

• Carry out programming/encoding.
• If no data can be read out from the previous control unit, carry out injection quantity compensation (description at end of instructions).

Switch off ignition.

Partially loosen the rear gasket (1) for the engine compartment lid until the screw is accessible from the cover of the electronics box.

Release all screws along line (2).

Remove the electronics box lid (3).

Fig 1: Identifying Engine Compartment Lid Rear Gasket And Electronics Box Lid

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Unfasten both connectors (1) in direction of arrow. Unplug connectors (1) from control unit and place to one side.

Fig 2: Removing Connectors From Control Unit

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Release retainers (1) on control unit.

Pull out control unit (2) towards top.

Fig 3: Pulling Out Control Unit

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Injection quantity compensation: 

If the DDE control unit has been replaced, it will also be necessary to carry out adjustment of the injectors!

The adjustment value (1) (7-position letter code/number code) is engraved on each injector (2).

Enter the numbers/letters according to the installation location (cylinder) of the injectors.

Fig 4: Identifying Injector Adjustment Value

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• Select "DDE".
• Select "Adjustment, injection quantity compensation"
• Select "Test plan"

The adjustment must be entered for each injector.

It is necessary to adjust the injectors to ensure their full functional capability.